MSI Geforce GTX 560ti TwinFrozr II default clock ?

In every monitoring tools I use, my default clock speed is at 750 Mhz. When I check on every internet page showing this video card, I see a default clock speed at 880 mhz. Why is my clock speed at 750 Mhz instead of 880 Mhz ? I use the lastest Nvidia drivers: 320.18

I downloaded MSI Afterburner and tried to overclock the card but it always "throlls" my GPU when benchmarking with Kombustor.

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The first thing is that if it is throttling, it is because of Kombustor.

This is a bad benchmark software because that thing makes EVERY air-cooled card to hit a thermal ceiling. Also, I have heard that some video drivers are
programmed to be limited in some "viral-like" applications, such as Kombustor. They are trying to run your card at 100% all the time, which is out of spec.

Me and my friend both have MSI 560 TI Frozr II cards, stock 880hz. He had his overclocked to 950hz for a while but then started having artifacting issues and returned to stock. I never overclocked since I didn't feel the need, but once he started having problems I tested mine out to just to see and I starting seeing artifacts in 3d applications right away. It seems like MSI tuned these cards appropriately for the voltage setting.

Neither of us played around with GPU voltage. Since the Frozr heatsinks do allow the card to run pretty cool it could probably handle to increasing voltage which should give a little more core clock headroom. But as I mentioned above personally I don't see the need. Barely any of the games I play max out the card and those that do only barely slow down.